minor fix

lib/mongo/cursor.rb

@@ -543,7 +543,7 @@ module Mongo
       else
         raise Mongo::OperationFailure, "Failure to continue iterating " +
           "cursor because the the replica set member persisting this " +
-          " cursor cannot be found."
+          "cursor at #{@read_pool.host_string} cannot be found."
       end
     end
 

lib/mongo/util/pool.rb

@@ -65,7 +65,6 @@ module Mongo
             warn "IOError when attempting to close socket connected to #{@host}:#{@port}: #{ex.inspect}"
           end
         end
-        @host = @port = nil
         @sockets.clear
         @pids.clear
         @checked_out.clear